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发表于 2022-3-1 02:36:11
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本帖最后由 人造人 于 2022-3-1 02:43 编辑
现学现卖,耗时4天,^_^
就我所知,目前拖放文件有两种完全不同的方法
一种是通过消息机制,使用 WM_DROPFILES 消息
另一种是通过 com 接口,使用 IDropSource IDataObject IDropTarget 这3个接口
第一种我弄懂了,写了一个C代码
第二种我找不到能用的资料,这方面的资料太少了
而且现在大部分软件已经不使用消息机制了,使用的是 com 接口
下面的代码是C语言版本的,核心原理就是一个全局钩子,在python中我还不知道怎么用全局钩子
如果你使用第一种方法的话,这方面的资料很多,你完全可以参考这个代码,把这个代码修改成python版本的
实在不行,你可以 python + c 呀,全局钩子的部分在 C 中做,就是在 python 中调用一下,这完全没有问题
对于第二种方法,我真的没办法了,这方面的资料真的太少了,^_^
drag.c#include <windows.h>
#include <wchar.h>
#include <strsafe.h>
#define BUFF_SIZE 4096
static TCHAR video_buff[BUFF_SIZE] = TEXT("hello world!");
static LRESULT CALLBACK MainWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
switch(message) {
case WM_CREATE: {
DragAcceptFiles(hwnd, TRUE);
return 0;
}
case WM_DROPFILES: {
HDROP hdrop = (HDROP)wParam;
POINT point; DragQueryPoint(hdrop, &point);
StringCchPrintf(video_buff, BUFF_SIZE, TEXT("point: (%ld, %ld)"), point.x, point.y);
UINT count = DragQueryFile(hdrop, 0xffffffff, NULL, 0);
TCHAR filename[MAX_PATH];
filename[0] = TEXT('\n');
for(UINT i = 0; i < count; ++i) {
DragQueryFile(hdrop, i, filename + 1, MAX_PATH - 1);
StringCchCat(video_buff, BUFF_SIZE, filename);
}
DragFinish(hdrop);
RECT rect;
GetClientRect(hwnd, &rect);
InvalidateRect(hwnd, &rect, TRUE);
return 0;
}
case WM_PAINT: {
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
RECT rect; GetClientRect(hwnd, &rect);
DrawText(hdc, video_buff, -1, &rect, DT_LEFT);
EndPaint(hwnd, &ps);
return 0;
}
case WM_DESTROY: {
DragAcceptFiles(hwnd, FALSE);
PostQuitMessage(0);
return 0;
}
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) {
const TCHAR szAppName[] = TEXT("MyWindows");
WNDCLASS wndclass = {0};
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = MainWndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if(!RegisterClass(&wndclass)) {
MessageBox(NULL, TEXT("这个程序需要在 Windows NT 才能执行!"), szAppName, MB_ICONERROR);
return 0;
}
HWND hwnd = CreateWindow(szAppName, TEXT("鱼C工作室"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
MSG msg;
while(GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
common.h#ifndef _COMMON_H_
#define _COMMON_H_
#include <windows.h>
typedef struct {
POINT point;
UINT count;
TCHAR path[0][MAX_PATH];
} shared_t;
#define SHARED_STRUCT_SIZE(n) (sizeof(shared_t) + n * sizeof(TCHAR [MAX_PATH]))
#endif
hook.c#include "common.h"
static HHOOK hhook;
static HINSTANCE hinstLib;
static HWND hwndCaller __attribute((section(TEXT("shared")), shared));
static void TargetWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
switch(message) {
case WM_DROPFILES: {
HDROP hdrop = (HDROP)wParam;
UINT count = DragQueryFile(hdrop, 0xffffffff, NULL, 0);
UINT block_size = SHARED_STRUCT_SIZE(count);
shared_t *shared = malloc(block_size);
DragQueryPoint(hdrop, &shared->point);
shared->count = count;
for(UINT i = 0; i < shared->count; ++i) {
DragQueryFile(hdrop, i, shared->path[i], MAX_PATH);
}
COPYDATASTRUCT cds = {0, block_size, shared};
HANDLE hMutex = CreateMutex(NULL, FALSE, TEXT("mutex_hook_dll"));
WaitForSingleObject(hMutex, INFINITE);
if(hwndCaller) SendMessage(hwndCaller, WM_COPYDATA, (WPARAM)hwnd, (LPARAM)&cds);
ReleaseMutex(hMutex);
free(shared);
break;
}
}
}
static LRESULT CALLBACK GetMsgProc(int nCode, WPARAM wParam, LPARAM lParam) {
switch(nCode) {
case HC_ACTION: {
MSG *pMsg = (MSG *)lParam;
TargetWndProc(pMsg->hwnd, pMsg->message, pMsg->wParam, pMsg->lParam);
break;
}
}
return CallNextHookEx(hhook, nCode, wParam, lParam);
}
void InstallHook(HWND hwnd) {
HANDLE hMutex = CreateMutex(NULL, FALSE, TEXT("mutex_hook_dll"));
WaitForSingleObject(hMutex, INFINITE);
hwndCaller = hwnd;
ReleaseMutex(hMutex);
hhook = SetWindowsHookEx(WH_GETMESSAGE, GetMsgProc, hinstLib, 0);
}
void UninstallHook(void) {
HANDLE hMutex = CreateMutex(NULL, FALSE, TEXT("mutex_hook_dll"));
WaitForSingleObject(hMutex, INFINITE);
hwndCaller = NULL;
ReleaseMutex(hMutex);
UnhookWindowsHookEx(hhook);
hhook = NULL;
}
BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID reserved) {
switch(reason) {
case DLL_PROCESS_ATTACH:
hinstLib = instance;
break;
}
return TRUE;
}
main.c#include "common.h"
#include <wchar.h>
#include <strsafe.h>
#define BUFF_SIZE 4096
static TCHAR video_buff[BUFF_SIZE] = TEXT("hello world!");
static HINSTANCE hinstLib;
static LRESULT CALLBACK MainWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
switch(message) {
case WM_CREATE: {
hinstLib = LoadLibrary(TEXT("hook.dll"));
void (*InstallHook)(HWND hwnd) = (void *)GetProcAddress(hinstLib, TEXT("InstallHook"));
InstallHook(hwnd);
return 0;
}
case WM_PAINT: {
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
RECT rect; GetClientRect(hwnd, &rect);
DrawText(hdc, video_buff, -1, &rect, DT_LEFT);
EndPaint(hwnd, &ps);
return 0;
}
case WM_COPYDATA: {
COPYDATASTRUCT *pcds = (COPYDATASTRUCT *)lParam;
shared_t *shared = (shared_t *)pcds->lpData;
StringCchPrintf(video_buff, BUFF_SIZE, TEXT("hwnd: %p\npoint: (%ld, %ld)"), wParam, shared->point.x, shared->point.y);
for(UINT i = 0; i < shared->count; ++i) {
StringCchCat(video_buff, BUFF_SIZE, TEXT("\n"));
StringCchCat(video_buff, BUFF_SIZE, shared->path[i]);
}
RECT rect;
GetClientRect(hwnd, &rect);
InvalidateRect(hwnd, &rect, TRUE);
return 0;
}
case WM_DESTROY: {
void (*UninstallHook)(void) = (void *)GetProcAddress(hinstLib, TEXT("UninstallHook"));
UninstallHook();
FreeLibrary(hinstLib);
PostQuitMessage(0);
return 0;
}
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) {
const TCHAR szAppName[] = TEXT("MyWindows");
WNDCLASS wndclass = {0};
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = MainWndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if(!RegisterClass(&wndclass)) {
MessageBox(NULL, TEXT("这个程序需要在 Windows NT 才能执行!"), szAppName, MB_ICONERROR);
return 0;
}
HWND hwnd= CreateWindow(szAppName, TEXT("鱼C工作室"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
MSG msg;
while(GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
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